.factory-wrapper div {
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  height: 502px;
  transition: all 0.2s;
}

.img-center-wrapper {
  width: 1200px;
  margin: 68px auto;
  display: flex;
  justify-content: space-between;
}

.factory-wrapper .bg-01 {
  height: 900px;
  width: 100%;
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-01.png?v0818");
}

.factory-wrapper .bg-02 {
  width: 572px;
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-02.png?v0818");
}

.factory-wrapper .bg-02:hover {
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-02-1.png?v0818");
}

.factory-wrapper .bg-03 {
  width: 572px;
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-03.png?v0818");
}

.factory-wrapper .bg-03:hover {
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-03-1.png?v0818");
}

.factory-wrapper .bg-04 {
  width: 572px;
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-04.png?v0818");
}

.factory-wrapper .bg-04:hover {
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-04-1.png?v0818");
}

.factory-wrapper .bg-05 {
  width: 572px;
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-05.png?v0818");
}

.factory-wrapper .bg-05:hover {
  background-image: url("https://qishan-lwj.oss-cn-hangzhou.aliyuncs.com/img/show/factory/znzz-05-1.png?v0818");
}